Hurry please and thank you ! (nvm but i will keep the question up) A light ray hits a hard, opaque object. The angle at which the light ray bounces off the object depends on

the smoothness of the surface.

the material the surface is made of.

the angle at which the light hits the surface.

the source of the light that hits the surface.

i think its 100.

hope this !

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.